When I try to export my IMovie as an MP4 video, I am now getting an error that I cannot fix.

Hi, iMovieIssuesKC,

The CompressorKit error is very pesky and has been reported frequently on

this forum of late. It seems to be related to an iTunes update that implants a

64 bit architecture into the system library. Thus, some people have solved this

by upgrading to Catalina, that is a 64 bit operating system. However, that

would render inoperable any legacy 32 bit programs that you may have on your

Mac, and also some legacy media would not play in iMovie and would need to be

converted.

Sometimes booting up in Safe Mode (see Finder menu for instructions) and

immediately shutting down and rebooting in normal mode helps. Opening

in a new library might be helpful as well.

Recently there has been a breakthrough on this issue, discovered by

nicocaro, who posted a solution on this forum. Below is a link to the thread

where he describes how to solve the problem by removing a 64bit architecture

from an iTunes update.  Other posters have successfully tried the

solution.

Here's the link to nicocaro's solution:

https://discussions.apple.com/thread/251266351

And here as well:

https://discussions.apple.com/thread/251352619

After doing the above your iPhone likely will not sync, although iMovie will

work.  To get your iPhone to sync again, see this link that solves that

issue:

https://discussions.apple.com/thread/251916124?answerId=253660165022&login=true

Here's another link, though older, that describes what others have tried

with the Compressor Kit Error:

https://discussions.apple.com/thread/8265338

There may be some proposed solutions in the above link that will work for

you.

All else failing, try calling Apple Support. The techs there are very savvy

and also have the capability of remotely accessing your computer. Click on the

Contact Support item in the upper right hand corner of this screen and navigate

to a place where you can provide your telephone number so that Apple Support

can call you back. I think that the file path is Contact Support/Mac

OS/Applications/iMovie. Good luck with this.

If you have time, post back with your results, as it may assist others who

have this perplexing issue, and will contribute to our data base.

-- Rich